N,N′-Bis(trimethylsilylmethyl)thiocarbamide and N,N′-Bis(trimethylsilylmethyl)-λ6-thiocarbamide S,S-Dioxide

Власова, Н. Н.; Grigor’eva, O. Yu.; Воронков, М. Г.

doi:10.1007/s11176-005-0334-7

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2016

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“…An analogous phenomenon was described for bpy. [8,9,[22][23][24][25] The UV-visible spectra were recorded in a pH-range from 10 to 2, in which only monoprotonated species are formed. [8,9,11] The pK a values were calculated with the programme Specfit: pK a = 3.9 AE 0.1 for bpy and pK a = 4.2 AE 0.1 for 1; these values are in accordance with the literature.…”

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confidence: 99%

Protonation Behaviour of Chiral Tetradentate Polypyridines Derived from α‐Pinene

Düggeli

Christen

Zelewsky

2004

Chemistry A European J

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Detailed protonation experiments of the [5,6]-pinenebipyridine molecule and the unsubstituted [4,5]- and [5,6]-CHIRAGEN[0] ligands in various solvents indicate a variety of structures of the protonated species. UV-visible and NMR measurements (including (15)N chemical shifts) show the transition from trans to cis conformation of [5,6]-pinenebipyridine upon protonation. The [4,5]-CHIRAGEN[0] ligand, in which the protonation sites of the nitrogen atom donors are at opposite sides of the molecule, behave essentially like two independent bipyridine moieties; this behaviour was monitored by UV-visible, CD and NMR spectroscopy (including (15)N data). In the case of the [5,6]-CHIRAGEN[0], a pocket of donor atoms provides a chiral environment for two protons per ligand.

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